Linear encoder feedback:absolute encoder！

The output for absolute and incremental encoders differs and is also a consideration for integration into the system’s control scheme. Absolute linear encoders produce a digital output, or “word,” that signifies the unit’s actual position. Resolution for an absolute encoder is determined by the number of bits in the word.

Incremental encoders produce quadrature output, with two channels that are 90 degrees out of phase. (The two channel output allows both position and direction to be monitored. If only position is needed, then only one channel is used.) Some incremental encoders produce a third channel with a single pulse, to be used as the index or reference position encoder for homing. The number of pulses per distance (inch or millimeter) determines the resolution of an incremental encoder. However, resolution can be doubled by counting both the leading and trailing edges of the pulse from one channel, or it can be quadrupled by counting the leading and trailing edges of the pulses from both channels.

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